Tony, 311Y is a number that appears on all recent Stihl saws on compliance label. The joke is that morons on E-bay will ignore the big model number on the top of the saw and list the saw as a model 311Y. We've seen every model of Stihl saw called a 311Y but most of them look like 017's
Marty, I didn't miss is, It just left me speechless! If these people spent a little time looking up the same item they're selling, they could put on an accurate listing even if they know nothing about the saw they're selling.